@charset "utf-8";
*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    background: #fff;
    font-size: 14px;
    color: #333;
}
ol,ul,li{
    list-style: none;
}
a{
    color: #fff;
    text-decoration: none;
}
img{
    display: block;
}
input{
    outline: none;
}
i,em{
    font-style: normal;
}
.clear::after{
    content: "";
    display: block;
    clear: both;
}


body {
    height: 1000px;
}

.box {
    width: 800px;
    height: 500px;
    margin: 30px auto;
    position: relative;
    top: 0;
    left: 0;
    overflow: hidden;
}

.img_box {
    width: 700%;
    height: 100%;
    margin-left: -800px;

}

.image {
    width: 800px;
    height: 500px;
    float: left;
}

.btn {
    width: 70px;
    height: 70px;
    position: absolute;
    top: 0;
    bottom: 0;
    margin: auto;
    text-align: center;
    font-size: 44px;
    line-height: 69px;
    background: rgba(0, 0, 0, .3);
    border-radius: 50%;
    color: #fff;
    cursor: pointer;
}

.leftBtn {
    left: 0;
}

.rightBtn {
    right: 0;
}

.dot_box {
    width: 200px;
    height: 20px;
    position: absolute;
    left: 0;
    right: 0;
    bottom: 20px;
    margin: auto;
    z-index: 4;
    display: flex;
    justify-content: space-between;
}

.dot {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #fff;
    opacity: .5;
    cursor: pointer;
}

li.active {
    background: #f50;
}
